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tachysterol

(tə-kĭstə-rôl′, -rōl′)
n.
  1. An isomer of ergosterol that forms vitamin D2 when irradiated with ultraviolet light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.